Mercury-vapor lamp



MARIE-JOSEPH CORNU.

MERCURY VAPOR LAMP. nna-mow FiLED FEB, 28. ms.

Patented Dec; 13, 1921.

2 SHEETS-SHEET MARIE-JOSEPH CORNU.

MERCURY VAPOR LAMP.

APPLICATION FILED FEB-28,1918.

1,400,346, Patented Dec. 13, 1921.

2 SHEETS-SHEET 2.

,Fig-Z F1915.-

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lot. 1

i i. we \idy; u 3.. km 1? Fig. l detain of he damping device.

eensbrieizional form 01 she he cathode 0f merctry 1s cam-Ode cempesed of another ea a miiar censomctionzii LONE me iiimnineting tube pieced Vertie-ally.

f'he damper of the oscillations of the mercury (Fig. 1 and Fig. 4:) -c0mpr1ses a, 50 semi-capillary tube a which enters the anode chamber'b and which constitutes an obstacle between the illuminating tube a and the compression tube (Z and ihrough which the mercury can only pass very slowly,

. gaseous mp is net'i che the i' be isfiiiea i inert 31' I an 3 0 11130.13, a rgon, ehe e IZQiDSfi-d mbe 1 7" inch e5: hem I v :ie; is in reietie" pole of d 6: with me me: @1121? tube Wiiih the L "i eating tube 0. Odie 2' is in. cam-i112. .Jzmsuppi generator. e11 is as folicrwsz- 'iiie current passe? eiaure 0 :3

unites the nee: Wnafing tub-e 0, compile. has 01" coneenseiien bulb m, m, m the ject of which'is to mei iiwin in Lise said 0111a during operation a small quantity 0? mercury. This device prevents suctlon mavements of the mercury in the capillary tufie, and prevents the fall of drops of mercury into the iiluminating tube during ape? "on. The arrangements indicateci above being maintaineci in a general way the mercury lamp mey be modified by replacing the me"- i y L cathode n (Figs. 5 and 6) formed of another metal such as iron, platinum, iridioplatinum, tungsten or others.

At the moment of striking, the arc is pro .luced between this cathode n and the mercury meniscus of the anode.

Nothing is changed either in the arc striking or in the actual operation of the lamp.

The lamp described possesses the property oi being able to strike its are just as well bymcre rocking as by the action of'the expansion of the gas under the influence of lJl I Q heating lamp.

The semi-capillary tube a. may be placed at any other point on the path of the mercury between the illuminating tube 0 and the tube (5.

What I claim is:

1. In a mercury vapor lamp, a stationary illuminating" tube, a compression tube connected to the anode, a semi-capillary tube inserted in the path of the mercury between thesaid illuminating tube and the said comprcssion tube, means assuring the electric connection between the two parts, and an arc-striking device 2. In a mercury'vapor lamp, a stationary illuminating tube, a comprcssion'tube connected to the anode, a semi-capillary tube insertedin the path oi. the mercury between the said. illuminating tube and the said compression tube, a metallic conductor travers mg the semi-capillary tube and connecting the two parts, and an arc-striking device.

3. In a mercury vapor lamp, an. illuminating tube, a compressiontube connected to the anode, a semi-capillary tube inserted in the path of the mercury between the said illuminating tube and the said compression tube, means assuring the electric connection between the two parts, an arc-striking tube, acapillary tube connecting the said are striking tube to the illuminating tube, small condensin chambers provided in the connecting tu e, heating means provided in the arc-striking tube.

4. In a mercury vapor lamp, an illuminating tube, a compression tube connected to the anode a semi-capillary tube inserted in the path or the mercury between the said illuminating tube and the said compression tube, means assuring the electric connection between the two parts, an arostriliing tube, a capillary tube connecting the said striking. tube to the illuminating tube, small condensin chambers provided in connecting tu e, a heating spiral. immersing the said arc-striking tube and connected series with the lamp.

5. In a mercury vapor lamp, a staticnar illuminating tube, a conipressior tube nected to the anode, a semi-ca inserted in the path of the mercur the said illuminating tube and the con pression tube, means assuring 1.1 ctric connection between the two pat striking tube, a capillary tube (John the arc-striking tube with the ill* inating tube, and a metallic cathode o than mercury.

6. In a mercury vapor lamp, an illnnib as are natingtube, a compression tub-la striking tube having a heating s in, connections between the said a sen tcapillary tube in the connection be tween the illuminating and the ccmptession tubes, a metallic conductor tracer the semi-capillary tube, and a capillary tube connecting the arc-striking tube the illuminating tube.

In testimony whereof It havehereuntc my hand at Paris (France), this February, 1913.

' MARIE JGSEPH CG In the presence of a witness:

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